OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › Bug Reports › Pb runmpi › Reply To: Pb runmpi August 10, 2019 at 10:28 am #4500 mathiasKeymaster Thanks for reporting! We have fixed that minor bug and we will release the fix in the next release. Meanwhile, please run the code only with as much cores as you have physically available in your system!